A multiplex router device, having a multiplex configuration, is instrumental in reducing internal and external traffic flows for a routing protocol process that occurs at a time of system switchover. A data base integration module, in a route calculation unit in the active mode, stores network link-state information collected by a routing protocol packet transmission-reception module in a link-state data base, and at the same time sends the information to a route calculation unit, but does not send routing protocol information collected. In the route calculation unit in the standby mode, a data base integration module that received the network link-state information stores its contents into its own link-state data base. When a failure occurs in the route calculation unit in the active mode, the route calculation unit performs the routing protocol process by using the stored link-state data base.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A router back-up method in a system where a plurality of routers are mutually connected via a network, comprising: passing a routing protocol process from a router in an active mode to a router in a standby mode when a failure occurs in said router in said active mode, wherein said router in said active mode and said router in said standby mode are each provided with the same router identification (ID) in advance, wherein each router comprises: a route calculation unit which performs a routing protocol process to create a routing table for deciding a packet route, and sends a packet in the network according to said routing table, wherein said route calculation unit of said router in said active mode performs said routing protocol process, holds routing protocol information including network link-state information containing identifying information of the router, neighboring router state information, and interface state information of said network to which said router is connected, and sends said network link-state information containing said identifying information of the router to said route calculation unit of said router in said standby mode, wherein said route calculation unit of said router in said standby mode receives and holds said network link-state information containing said identifying information of the router sent from said router in said active mode, monitors said router in said active mode, and when said router in said standby mode is shifted from said standby mode to said active mode due to a failure that occurred in said router in said active mode, said router shifted from said standby mode to said active mode takes over said routing protocol process as a router specified by said identifying information of the router in which the failure has occurred and which sent said network link-state information containing said identifying information, wherein said router shifted from said standby mode to said active mode performs said routing protocol process according to said network link-state information containing said identifying information of the router held in said router shifted from said standby mode to said active mode.
2. A router back-up method in a system where a plurality of routers are mutually connected via a network, comprising: passing a routing protocol process from a router in an active mode to a router in a standby mode when a failure occurs in said router in said active mode, wherein said router in said active mode and said router in said standby mode are each provided with the same router identification (ID) in advance, wherein each router comprises: a route calculation unit which performs a routing protocol process to create a routing table for deciding a packet route and sends a packet in said network according to said routing table, wherein said route calculation unit of said router in said active mode performs said routing protocol process, holds routing protocol information including network link-state information containing identifying information of the router, neighboring router state information, and interface state information of said network to which said router is connected, and sends said network link-state information containing identifying information of the router to said route calculation unit of said router in said standby mode to permit said router in said standby mode to monitor said router in said active mode and when said router in said standby mode is shifted from said standby mode to said active mode due to a failure that occurred in said router in said active mode, said router shifted from said standby mode to said active mode takes over said routing protocol process as a router specified by said identifying information.
3. A router back-up method in a system where a plurality of routers are mutually connected via a network comprising: passing a routing protocol process from a router in an active mode to a router in a standby mode when a failure occurs in said router in said active mode, wherein said router in said active mode and said router in said standby mode are each provided with the same router identification (ID) in advance, wherein each router comprises: a route calculation unit which performs a routing protocol process to create a routing table for deciding a packet route and sends a packet in said network according to said routing table, wherein said router calculation unit of said router in said standby mode receives and holds network link-state information containing identifying information of the router sent from said router in said active mode, monitors said router in said active mode, and when said router in said standby mode is shifted from said standby mode to said active mode due to a failure that occurred in said router in said active mode, said router shifted from said standby mode to said active mode takes over the routing protocol process as a router specified by said identifying information of the router in which the failure has occurred and which sent said network link-state information containing said identifying information, wherein said router shifted from said standby mode to said active mode performs said routing protocol process according to said network link-state information containing said identifying information of the router held in said router shifted from said standby mode to said active mode.
4. The router back-up method according to claim 1 , wherein said routing protocol process includes collecting routing protocol information.
5. A network system where a plurality of routers are mutually connected via a network, each router comprising: a route calculation unit which performs a routing protocol process to create a routing table for deciding a packet route and sends a packet in said network according to said routing table, wherein said router includes a router in an active mode and a router in a standby mode, wherein said router in said active mode and said router in said standby mode are each provided with the same router identification (ID) in advance, wherein said route calculation unit comprises: holding means for holding network link-state information; wherein said router in said active mode comprises: sending means for sending said network link-state information containing identifying information of the router to said route calculation unit of said router in said standby mode, when a failure occurs in said router in the active mode; and wherein said router in said standby mode comprises: receiving means for receiving said network link-state information containing said identifying information of the router forwarded from said router in said active mode, storing means for storing said network link-state information containing identifying information of the router in said holding means, and monitoring means for monitoring said router in said active mode and when said router in said standby mode is shifted from said standby mode to said active mode due to a failure that occurred in said router in said active mode, said router shifted from said standby mode to said active mode takes over a routing protocol process as a router specified by said identifying information of the router in which the failure has occurred and which sent said network link-state information, wherein said router shifted from said standby mode to said active mode performs said routing protocol process according to said network link-state information containing said identifying information of the router held in said router shifted from said standby mode to said active mode.
6. A router used in a network system where plurality of routers are mutually connected via a network, each router comprising: a route calculation unit which performs a routing protocol process to create a routing table for deciding a packet route, and sends a packet in said network according to said routing table, wherein said router is in either of an active mode and a standby mode, wherein when said router is in said active mode, said router is provided in advance with the same router ID as another router which is in said standby mode and which serves as a standby router to said router, wherein when said router is in said standby mode, said router is provided in advance with the same router ID as another router which is in said active mode to which said router serves as a standby router, and wherein said route calculation unit comprises: holding means for holding network link-state information containing identifying information of the router, and sending means for sending said network link-state information containing identifying information of the router to one of the other routers in said standby mode, when said router is in said active mode and a failure occurs to permit said router in said standby mode to monitor said router in said active mode and when said router in said standby mode is shifted from said standby mode to said active mode due to a failure that occurred in said router in said active mode, said router shifted from said standby mode to said active mode takes over said routing protocol process a router specified by said identifying information.
7. A router used in a network system where a plurality of routers are mutually connected via a network, each router comprising: a route calculation unit which performs a routing protocol process to create a routing table for deciding a packet route, and sends a packet in the network according to said routing table, wherein said router comprises a router in an active mode and a router in a standby mode, wherein said router in said active mode and said router in said standby mode are each provided with the same router identification (ID) in advance, holding means for holding network link-state information containing identifying information of the router; means for receiving said network link-state information containing identifying information of the router sent from said router in said active mode; and monitoring means for monitoring said router in said active mode and when said router in said standby mode is shifted from said standby mode to said active mode due to a failure that occurred in said router in said active mode, said router shifted from said standby mode to said active mode takes over a routing protocol process as a router specified by said identifying information of the router in which the failure has occurred and which sent said network link-state information containing said identifying information, wherein said router shifted from said standby mode to said active mode performs said routing protocol process according to said network link-state information containing said identifying information of the router held in said router shifted from said standby mode to said active mode.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
January 6, 2000
December 3, 2002
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